晶体基质对稀土上转换纳米材料中能量转换机理的影响

采用溶剂热法制备了尺寸均一、形貌规整的Yb^(3+),Er^(3+)共掺NaREF4(RE^(3+)=Lu^(3+),Y^(3+),Yb^(3+))纳米材料,借助稳态发光光谱和时间分辨光谱技术表征了3种基质纳米材料上转换发光行为的特性,并评估了能量传递机制.结果表明,NaLuF_4∶20%Yb^(3+),2%Er^(3+)纳米材料具有较强的稳态发光强度、较高的绿红比(540 nm/654 nm)和较长的发光寿命,NaYbF_4∶2%Er^(3+)纳米材料具有较弱的上转换发光强度、较低的绿红比(540 nm/654 nm)和较短的发光寿命.结合实验数据及能量传递机制,探讨了不同基质(NaLuF_4,NaF_4,NaYbF_4)在稀土掺杂纳米材料中对上转换能量传递机制的影响,解释了NaLuF_4基质纳米材料是较好基质材料的原因.

玫瑰痤疮的发病机制、合并症及相关研究进展

玫瑰痤疮是一种主要累及面中部的慢性炎症性皮肤病,其发病机制尚不清楚,遗传和环境因素可造成免疫系统失调而诱发,并且加重病情。玫瑰痤疮与部分慢性疾病相关,原因不明,可能与免疫失调有关。在临床实践中,原有的亚型分类近年来逐渐转变为表型分类,并且以此指导治疗,治疗方法以对症治疗为主,一些分子机制的研究也提供了新的治疗方向。本综述回顾了近年来在该领域的研究进展。

面部损容性皮肤病合并精神疾病的相关研究进展

为归纳各种常见的面部损容性皮肤病与精神疾病的合并情况,本文对面部损容性皮肤病合并精神疾病的相关研究进行了汇总。寻常痤疮、玫瑰痤疮、黄褐斑、斑秃、脂溢性皮炎等面部损容性皮肤病与多种精神疾病存在相关性,其中以焦虑、抑郁最为普遍。皮肤科的临床治疗中,应当对面部损容性皮肤病患者的精神状况予以关注,必要时转诊精神科或心理医学科,使用皮肤病学和精神病学的跨学科方法解决临床问题,满足患者需求。

Contributions of Chinese scholars to body donation research in international journals

Anatomical dissectionis an important part of human anatomy course and relies much on cadavers.Body donation is the primary source of cadavers used in ana tomical dissection course in China.This study aimed to systematically review the contributions of Chinese scholars to body donation research in international journals,in the 100^(th) anniversary of the foundation of Chinese Society for Anatomical Sciences.The search was conducted on May 12,2020.The searching strategy was(body or anatomy or anatomical or cadaver or cadaveric)and(donate or donation or bequest or gift or gifting)and(China or Hong Kong or Macao or Taiwan).Only English articles focusing on body donation research were included.A total of 578 articles were retrieved.

A novel formulation of bupivacaine-encapsulated PLGA nanoparticles in peripheral analgesia

Bupivacaine encapsulated poly(lactidecoglycolide)nanoparticles is a novel formulation of extended-release of bupivacaine in poly(lactidecoglycolide)matrix.We evaluated the efficacy and safety of bupivacaine nanoparticles in peripheral analgesia via behavior tests,electrophysiological recordings,pharmacokinetic analysis,and pathology staining by employing the models of uninjured rats and mice.Nanoparticles injection increased the pain thresholds of rats and mice for 21 days.

Research status and hotspot analysis of body donation in China:A CiteSpace-based study

To provide references by analyzing the history,hotspot,and trend of the research in body donation,CiteSpace software was used to conduct a co occurrence network analysis,and 196 articles in CNKI database were included.With the increasing number of articles in recent years,“Political and legal organizations”and“medical schools and departments”were main research institutions.

Observational evidences for the speed of the gravity based on the Earth tide

We have found that the current practical Newtonian formula for the gravity tide of the Earth implies a hypothesis that gravity travels at the speed of light; furthermore, we have derived and solved the propagation equation of gravity using the observation data of Earth tides from Shiquanhe and Wushi, after correction of phase lag due to the anelasticity of the Earth, and found that the speeds of gravity are from 0.93 to 1.05 times the speed of light with a relative error of about 5%. This provides first set of strong evidences to show that the speed of gravity is the same as the speed of light.

Gravity anomaly during the Mohe total solar eclipse

By using a high-precision LaCoste-Romberg (D-122#) gravimeter, continuous and precise measurements were carried out during the March 9,1997 total solar eclipse in the Mohe region in Northeast China. The gravity variations were digitally recorded during the total solar eclipse so as to investigate the possible anomaly of the sun and the moon’s gravitational fields on the earth. After the careful processing and analysis of the observed data, no significant anomaly during the very solar eclipse has been found. However, there are two ’gravity anomaly valleys’ with near symmetrical decrease of about 6-7 μGal at the first contact and the last contact. This is the anomaly phenomenon observed and reported for the first time in the literature. This note presents some analyses and discussions.